Re: 99 Jeep grand cherokee lift kit
Older GC Jeeps had solid axles front and rear which typically is cheaper to lift than independent suspension.
I think ZJ's MY 93-98 were the last to have solid axles so I am thinking that is what you mean by older
On ZJ's You could do a modest 2" budget boost for $200
Anything higher requires longer control arms, track bar ... At least to do it right
If your 99 has independent suspension no way to use older style lift kits